ISTRAŽIVANJE UTJECAJA USPJEHA NA STUDIJU NA ODABIR STRUČNE SPECIJALIZACIJE

The aim of the research presented in this paper was to identify the relation of mechanical engineering students’ individual motives and their choice of specialty to success in their studies. The research includes consideration of motivational factors from a number of aspects. The results suggest a connection between academic success and the motives of professional advancement, success in the profession, achieving perceptible success at work, opportunities for hierarchical advancement in a company and others. In accordance with the expressed motives, the results highlight the importance of individual specialties for students depending on the success achieved in the course of their studies.Cilj je istraživanja prikazanog u ovom radu utvrditi povezanost između pojedinačnih motiva studenata strojarstva i njihovog odabira specijalizacije s obzirom na uspjeh u tijeku studija. Istraživanje uključuje razmatranje motivacijskih čimbenika s različitih gledišta. Rezultati upućuju na povezanost između uspjeha na studiju i motiva profesionalnog napredovanja, uspjeha u struci, postignuća vidljivog uspjeha na poslu, mogućnosti hijerarhijskog napredovanja u tvrtki i drugih. U skladu s izraženim motivima, rezultati upućuju na važnost pojedine specijalizacije za studente ovisno o postignutom uspjehu u tijeku studij

Cylindrical-parabolic reflector with printed antenna structures

The paper presents concept of design and realization of the new class of printed antenna structures which consist of a linear axial array of dipoles, subreflector, feed network and a bal-un, all printed on a common dielectric substrate. The array is positioned on the axis focus of the cylindrical-parabolic reflector. Use of the reflector enables reducing back side radiation and shaping beamwidth in H-plane thus obtaining higher gain while the printed subreflector gives the possibility of achieving additional gain. Besides, by using dipoles with pentagonal shape that operate on the second resonance, enhanced bandwidth of the array has been accomplished. Four variants of such arrays have been realized: two of them with 8 radiating elements for the frequency range around 26 GHz - one with uniform and the other with tapered feed distribution, featuring gains of 27.5 dBi and 25.7 dBi, respectively. The latter has the side lobe suppression of 28 dB in E-plane. Two other arrays that are intended for ranges around 23 GHz and 60 GHz have 16 radiating elements, uniform feed distribution and measured gains of 33 dBi and 34 dBi, respectively. Bandwidths of all realized model for S11 less than -10 dB is around 30 %. In all cases agreement between simulated and measured results is very good

Mycotoxicoses in animals caused by secondary metabolites of molds

It is estimated that at least 25% of grain and other cereals are today contaminated with known mycotoxins, while a large number of them are probably contaminated with as yet unidentified mycotoxins. Mycotoxins produce mold mycea, and it is believed that over 220 species have this characteristic. A large number of different mycotoxins has been identified so far, of which only a small number are of medicinal, nutritive and economic significance (aflatoxins, ochratoxins, trichotecenes, zearalenon). The listed mycotoxins present secondary metabolites, primarily the species Aspergillus, Fusarium and Penicillinum. Mycotoxicoses pose a nutritive-medical, but also a diagnostic problem, because certain mycotoxins cause changes in a number of organs. Diseases caused by mycotoxins are not contagious, they are connected with food and/or specific feed, they are similar to avitaminoses, they are not treated with antibiotics or other medicines, and they do not cause an immunological response in the organism because they are of small molecular mass so that animals are permanently protected from their effects. The content of mycotoxins in food and/or feed in practical conditions more often causes the appearance of chronic mycotoxicoses, and the effects of smaller quantities over a longer time period are the same as of bigger quantities over a short period. The early or timely establishment of the presence of mycotoxins in food and the subsequent elimination of the contaminated food from use can aleviate the negative effects, but a certain time period is required for the elimination of the resorbed quantities of mycotoxins and the disappearance of the harmful effect. That is why constant and multilevel monitoring of sanitary hygiene of feed must be practiced in production conditions in order to secure a swift and efficient reaction, as currently the only manner for the successful prevention of the harmful effects of mycotoxins

Risk management in information system projects

Ovaj članak predstavlja studiozan pregled ključnih čimbenika uspjeha projekta u provedbi informacijskog sustava u poslovnim sustavima. Članak prikazuje rezultate teorijskih i praktičnih istraživanja, koja pokazuju da proces upravljanja razvojnim projektima informacijskih sustava ima mnogo problema i neizvjesnosti u praksi, koji se unatoč brojnim poboljšanjima u području razvoja metoda, tehnika i alata još uvijek suočavaju s nekim problemima i teškoćama u procesu implementacije integriranih informacijskih sustava. Upravljanje projektima implementacije ERP (planiranja resursa poduzeća) je povezano s različitim specifičnim problemima, koji su bitno različiti od onih tradicionalnih informacijskog sustava razvoja, jer sadrže strateške, taktičke, organizacijske čimbenike te čimbenike poslovnog okruženja.This paper presents a studious overview of key project success factors in the implementation of information system to business systems. The paper presents the results of theoretical and practical studies, which have shown that the process of managing development of information system projects holds many problems and uncertainties in practice, which despite many improvements in the area of development methods, techniques and tools are still facing some problems and difficulties in the process of implementation of integrated information systems. Managing ERP implementation projects is associated with different specific problems, which are essentially different from the traditional information system developments, because they contain the strategic, tactical, organizational and business environment factors

Improved DNA-based identification of cervidae species in forensic investigations

The main reasons for wildlife forensic research are animal poaching, illegal trade, and falsified game meat products. Small trace amounts, old and degraded materials present the most common samples in revealing criminal activities in this field. This is the reason why it is crucial to use adequate and reliable methods and samples to identify animal species killed outside the hunting season or species protected by law. In this study, different endpoint PCR and real-time PCR protocols were compared in the identification of three Cervidae species (Capreolus capreolus, Cervus elaphus, Dama dama) from old and damaged material found in an enclosed area where the animals were kept. From a total of 129 samples, end point PCR provided results for 119 samples, while real-time PCR was successful in all cases. Also, we created and tested a protocol for simultaneous analyses of different types of samples, which is of great importance as when the amplification is carried out simultaneously it is more cost efficient and speeds up the process

Cylindrical-parabolic reflector with printed antenna structures

The paper presents concept of design and realization of the new class of printed antenna structures which consist of a linear axial array of dipoles, subreflector, feed network and a bal-un, all printed on a common dielectric substrate. The array is positioned on the axis focus of the cylindrical-parabolic reflector. Use of the reflector enables reducing back side radiation and shaping beamwidth in H-plane thus obtaining higher gain while the printed subreflector gives the possibility of achieving additional gain. Besides, by using dipoles with pentagonal shape that operate on the second resonance, enhanced bandwidth of the array has been accomplished. Four variants of such arrays have been realized: two of them with 8 radiating elements for the frequency range around 26 GHz - one with uniform and the other with tapered feed distribution, featuring gains of 27.5 dBi and 25.7 dBi, respectively. The latter has the side lobe suppression of 28 dB in E-plane. Two other arrays that are intended for ranges around 23 GHz and 60 GHz have 16 radiating elements, uniform feed distribution and measured gains of 33 dBi and 34 dBi, respectively. Bandwidths of all realized model for S11 less than -10 dB is around 30 %. In all cases agreement between simulated and measured results is very good

Cylindrical-parabolic reflector with printed antenna structures

The paper presents concept of design and realization of the new class of printed antenna structures which consist of a linear axial array of dipoles, subreflector, feed network and a bal-un, all printed on a common dielectric substrate. The array is positioned on the axis focus of the cylindrical-parabolic reflector. Use of the reflector enables reducing back side radiation and shaping beamwidth in H-plane thus obtaining higher gain while the printed subreflector gives the possibility of achieving additional gain. Besides, by using dipoles with pentagonal shape that operate on the second resonance, enhanced bandwidth of the array has been accomplished. Four variants of such arrays have been realized: two of them with 8 radiating elements for the frequency range around 26 GHz - one with uniform and the other with tapered feed distribution, featuring gains of 27.5 dBi and 25.7 dBi, respectively. The latter has the side lobe suppression of 28 dB in E-plane. Two other arrays that are intended for ranges around 23 GHz and 60 GHz have 16 radiating elements, uniform feed distribution and measured gains of 33 dBi and 34 dBi, respectively. Bandwidths of all realized model for S11 less than -10 dB is around 30 %. In all cases agreement between simulated and measured results is very good

Trovanja životinja izazvana sekundarnim metabolitima plesni

It is estimated that at least 25% of grain and other cereals are today contaminated with known mycotoxins, while a large number of them are probably contaminated with as yet unidentified mycotoxins. Mycotoxins produce mold mycea, and it is believed that over 220 species have this characteristic. A large number of different mycotoxins has been identified so far, of which only a small number are of medicinal, nutritive and economic significance (aflatoxins, ochratoxins, trichotecenes, zearalenon). The listed mycotoxins present secondary metabolites, primarily the species Aspergillus, Fusarium and Penicillinum. Mycotoxicoses pose a nutritive-medical, but also a diagnostic problem, because certain mycotoxins cause changes in a number of organs. Diseases caused by mycotoxins are not contagious, they are connected with food and/or specific feed, they are similar to avitaminoses, they are not treated with antibiotics or other medicines, and they do not cause an immunological response in the organism because they are of small molecular mass so that animals are permanently protected from their effects. The content of mycotoxins in food and/or feed in practical conditions more often causes the appearance of chronic mycotoxicoses, and the effects of smaller quantities over a longer time period are the same as of bigger quantities over a short period. The early or timely establishment of the presence of mycotoxins in food and the subsequent elimination of the contaminated food from use can aleviate the negative effects, but a certain time period is required for the elimination of the resorbed quantities of mycotoxins and the disappearance of the harmful effect. That is why constant and multilevel monitoring of sanitary hygiene of feed must be practiced in production conditions in order to secure a swift and efficient reaction, as currently the only manner for the successful prevention of the harmful effects of mycotoxins.Procenjuje se da je danas najmanje 25 posto žitarica i drugog zrnevlja kontaminisano poznatim mikotoksinima, dok je, verovatno, veliki deo kontaminisan još neidentifikovanim mikotoksinima. Mikotoksine produkuju gljivice plesni, a smatra se da ovu osobinu poseduje više od 220 vrsta. Do sada je poznat veliki broj različitih mikotoksina od kojih samo manji broj ima medicinski, nutritivni i ekonomski značaj (aflatoksini, ohratoksini, trihoteceni i zearalenon). Navedeni mikotoksini predstavljaju sekundarne metabolite, pre svega, Aspergillus, Fusarium i Penicillium vrsta. Mikotoksikoze predstavljaju nutritivno-medicinski, ali i dijagnostički problem, jer pojedini mikotoksini izazivaju promene na više organa. Oboljenja koja izazivaju mikotoksini nisu kontagiozna, vezana su za hranu i/ili specifična hraniva, slična su avitaminozama, ne leče se antibioticima i drugim lekovima, a u organizmu ne izazivaju imunski odgovor, jer su male molekulske mase, pa su životinje trajno nezaštićene od njihovog delovanja. Sadržaj mikotoksina u hranivima i/ili hrani u praktičnim uslovima češće izaziva pojavljivanje hroničnih mikotoksikoza, a delovanje manjih količina tokom dužeg vremenskog perioda ima iste efekte kao veće količine tokom kraćeg vremenskog perioda. Ranim, odnosno pravovremenim utvrđivanjem prisustva mikotoksina u hrani i posledičnim isključivanjem kontaminisane hrane iz upotrebe mogu da se ublaže negativni efekti, ali je potreban određeni vremenski period za eliminisanje resorbovane količine mikotoksina i štetnog efekta. Zato u proizvodnim uslovima mora da se praktikuje stalni i višestepeni monitoring higijenske ispravnosti hrane radi brzog i efikasnog reagovanja, kao, za sada jedinog, načina uspešne prevencije štetnih efekata mikotoksina

THE RELATIONSHIP BETWEEN TECHNICAL AND TACTICAL ELEMENTS OF DIRECT POINTS WITH REGARD TO THE QUALIFICATIONS FOR THE 2018 VOLLEYBALL WOMEN’S WORLD CHAMPIONSHIP

The goal of this paper is to analyse the relationships and differences among volleyball teams, participants of the 2018 World Cup in Japan, divided into three categories by their final standings (1st to 4th place, 5th to 8th place and others), based on the elements of situation-based efficiency. For the purposes of this paper, information from the official match reports (p 2 report) related to the way of winning points in the match was used, and these data were analysed using the program Volleyball Information System (VIS). The data obtained were analysed in relation to the team category and the outcome of the match. The data were obtained using descriptive and comparative statistical procedures. The survey sample includes all the women’s volleyball championship games played in Japan in 2018. Based on the final standings, the teams were divided into three groups: 1) the teams who reached the 3rd stage of the tournament (6 teams, from 1st to 6th place); 2) the teams that finished the competition in phase 2 (10 national teams, ranking 7th to 16th); 3) national teams that finished the competition in phase 1 (8 national teams, ranking 17th to 24th). The results obtained indicate that the teams had an equally good performance of the block and serve game elements; statistically these were not significant for the match outcome, but they rather serve as an aid for the overall game and for the final outcome of the match. The results of this research also highlight the spike as the key element affecting the positive end result of the match. It is important to emphasize that the opponent errors are a factor that depends exclusively on the opponent, but they also determine the overall score of the winning team

Middle ear tuberculosis: Diagnostic criteria

Introduction. Tuberculous otitis is a diagnostic problem due to the difficulty to obtain microbiological, histomorphological and cytological confirmation of the disease. Objective. Our objective was to compare clinical and radiological characteristic and development of otogenic complications in patients with tuberculous otitis and otitis with cholesteatoma as the most destructive form of chronic nonspecific otitis in the purpose of establishing the diagnostic criteria for tuberculous otitis. Methods. Medical records of 12 patients with tuberculous otitis and 163 patients with cholesteatoma treated at the Institute of Otorhinolaryngology and Maxillofacial Surgery in Belgrade during the eight-year period were analyzed. All of the patients underwent otomicroscopic, audiological and radiological examination of the thorax and temporal bone, microbiological examination of the secretion and histomorphological examination of the tissue taken during middle ear surgery. Statistical analysis was done using χ2 test with Yates correction. Results. Otogenic complication as facial palsy and sensorineural hearing loss were more frequent in tuberculous otitis patients, than in cholesteatoma. Also, fistulas of the labyrinth and facial canal bone destruction were also more frequent in tuberculous otitis than in cholesteatoma. A larger extent of temporal bone destruction was noticed on CT scans of the temporal bone in half of the patents with tuberculous otitis. Coexistence with miliary pulmonary tuberculosis was detected in one third of the patients. There were no microbiological or histomorphological confirmations of the disease, except in one case with positive Ziehl-Neelsen staining. Conclusion. Tuberculous otitis media should be considered in patients with serious otogenic complications and with shorter duration of ear discharge, and in association with diagnosed miliary pulmonary tuberculosis and extensive temporal bone destruction. Polymerase chain reaction still is not reliable for diagnosis